If your looking for a herbal aphrodisiac yohimbine is very nice. It works very well, it can cut recovery time between orgasams down to minutes. It can be a bit jittery thought.
As far as synthetic aphrodisiacs meth is a no brainer and I have found 2C-B to be a excellent choice as well.
MDMA may work also for some people. Personally ive found it to have negative sexual side effects. The physical aspect is certainly there but I get to easily distracted on it
Good post, I gotta clarify (too lazy/disingenuous to edit ;P )
Yohimbine is def a good otc/herbal product. I personally dislike the stimulation (and never go past half a pill

-4mg> of yohimbineHCL, but it def has a ... errr... effect like I'd imagine viagra would, lol )
I've never tried actual meth, but any stim (including desoxyn..) is easily trumped by mdma/mda/mdea imo. 2C's are def good, but that'd require getting into "type of sex", however seeing as how prodigy went there, I will

.
MDXX compounds are far less 'trippy' than 2cX compounds, that goes w/o saying. IMO, this becomes more a question of the 'type' of sexual-stimulant you're looking for. MDXX is not always sexual for me, in fact sometimes I would actually prefer a 2cX(or any phen/trypt), it depends on the situation - I guess I should qualify my recommendation in terms of sex, and I feel that for sex/sexual-like activities w/ someone I actually like (as a person), any MDxx compound is a no-brainer (better if candy/hippy tripping), but for more 'random' encounters, 2C's(or any regular psych's, really) are superior. I guess I think MDxx compounds allow far room when dealing w/ a psychological+physical situation than any psych's alone would, whereas in a more 'physical-only' situation, sometimes 2c's(+most other psych's) are a definite winner. To go there tho is to already understand sex-relative-to-compounds, I doubt that this is something that bears reference to someone who doesn't already have a grasp. To someone who's only rolled/tripped like 5-10X, I'd still say you're more likely to have fun on an mdxx compound than when you're tripping.
/god that probably came across terrible if it was coherent, shouldn't post while intoxicated ;P